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Tesla is expected to unveil its long-awaited semi truck this Thursday, CEO Elon Musk said on Twitter.

On Sunday, Musk tweeted that the official unveiling would take place on Thursday at 8pm, promising it would “blow your mind clear out of your skull and into an alternate dimension.”

Very little is actually known about the truck’s design, but a few Tesla watchers have speculated a prototype could resemble a futuristic, concept-looking truck that is visually stimulating and environmentally friendly.